The purpose of the study was to report and statistically analyze psychometric data on PTSD symptoms collected during 80 psychiatric evaluations of patients applying to the New Mexico Medical Cannabis Program from 2009 to 2011.

Researchers used the Clinician Administered Posttraumatic Scale to determine symptom scores of 80 individuals with PTSD before and after they began using marijuana. According to the data garnered from the study, marijuana was found to reduce a person’s symptom score by an average of 75%.

They concluded marijuana is associated with reductions in PTSD symptoms in some patients, and prospective, placebo-controlled study is needed to determine efficacy of marijuana and its constituents in treating PTSD.